Statistics for occurrence #1 of “Lieutenant-Commander John G. Walker” in chapter 5.74 of Robert Underwood Johnson, Clarence Clough Buell, Battles and Leaders of the Civil War. Volume 3.:

... importance. The naval expedition, which was commanded by Lieutenant-Commander Watson Smith, was composed of two iron-clads, the Chillicothe, Lieutenant-Commander James P. Foster, and the DeKalb, Lieutenant-Commander John G. Walker , and the tin-clads Rattler, Forest Rose, Romeo, Marmora, Signal, and Petrel. To these were added two vessels of the ram fleet, the Fulton and Lioness. The only troops at first ordered to accompan...
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